121705051620 has 24 divisors (see below), whose sum is σ = 340774144704. Its totient is φ = 32454680416.

The previous prime is 121705051619. The next prime is 121705051649. The reversal of 121705051620 is 26150507121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1014208704 + ... + 1014208823.

It is an arithmetic number, because the mean of its divisors is an integer number (14198922696).

Almost surely, 2^121705051620 is an apocalyptic number.

121705051620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121705051620 is an abundant number, since it is smaller than the sum of its proper divisors (219069093084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121705051620 is a wasteful number, since it uses less digits than its factorization.

121705051620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2028417539 (or 2028417537 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

Adding to 121705051620 its reverse (26150507121), we get a palindrome (147855558741).

The spelling of 121705051620 in words is "one hundred twenty-one billion, seven hundred five million, fifty-one thousand, six hundred twenty".